fix: improve oidc issuer / endpoints (#3753)

* fix: improve oidc issuer / endpoints

* docs: update endpoints

internal/api/grpc/management/information.go

@@ -15,7 +15,7 @@ func (s *Server) Healthz(context.Context, *mgmt_pb.HealthzRequest) (*mgmt_pb.Hea
 }
 
 func (s *Server) GetOIDCInformation(ctx context.Context, _ *mgmt_pb.GetOIDCInformationRequest) (*mgmt_pb.GetOIDCInformationResponse, error) {
-	issuer := http.BuildOrigin(authz.GetInstance(ctx).RequestedDomain(), s.externalSecure) + s.issuerPath
+	issuer := http.BuildOrigin(authz.GetInstance(ctx).RequestedHost(), s.externalSecure)
 	return &mgmt_pb.GetOIDCInformationResponse{
 		Issuer:            issuer,
 		DiscoveryEndpoint: issuer + oidc.DiscoveryEndpoint,

internal/api/grpc/management/server.go

@@ -31,7 +31,6 @@ type Server struct {
 	passwordHashAlg   crypto.HashAlgorithm
 	userCodeAlg       crypto.EncryptionAlgorithm
 	externalSecure    bool
-	issuerPath        string
 	auditLogRetention time.Duration
 }
 
@@ -41,7 +40,6 @@ func CreateServer(
 	sd systemdefaults.SystemDefaults,
 	userCodeAlg crypto.EncryptionAlgorithm,
 	externalSecure bool,
-	issuerPath string,
 	auditLogRetention time.Duration,
 ) *Server {
 	return &Server{
@@ -52,7 +50,6 @@ func CreateServer(
 		passwordHashAlg:   crypto.NewBCrypt(sd.SecretGenerators.PasswordSaltCost),
 		userCodeAlg:       userCodeAlg,
 		externalSecure:    externalSecure,
-		issuerPath:        issuerPath,
 		auditLogRetention: auditLogRetention,
 	}
 }

internal/api/oidc/op.go

@@ -26,10 +26,6 @@ import (
 	"github.com/zitadel/zitadel/internal/telemetry/metrics"
 )
 
-const (
-	HandlerPrefix = "/oauth/v2"
-)
-
 type Config struct {
 	CodeMethodS256                    bool
 	AuthMethodPost                    bool
@@ -89,7 +85,7 @@ func NewProvider(ctx context.Context, config Config, defaultLogoutRedirectURI st
 	}
 	provider, err := op.NewDynamicOpenIDProvider(
 		ctx,
-		HandlerPrefix,
+		"",
 		opConfig,
 		storage,
 		options...,